On September 9, The Regional Greenhouse Gas Initiative (RGGI) announced that a mere 18 percent of the 42 million carbon dioxide allowances offered in a Sept. 7 auction were actually sold. Thirty-one entities purchased the allowances at the minimum reserve price of $1.89 apiece, and for the first time ever none of the allowances available for use after 2012 was purchased. Energy efficiency and an anemic economy have both contributed to a depressed market for allowances.